What does softening point of bitumen indicate?
The softening point is reported as the mean of the temperatures at which the two disks soften enough to allow each ball, enveloped in bitumen, to fall a distance of 25 mm (1.0 in.). …
What is the relation between softening point and bitumen grade?
Based of charts, for modified bitumen binders we can state that, the viscosity decreases with increasing softening point, but for paving grade bitumen we can state that, the viscosity decreases with the increasing softening point.
What are the factors that influence the result of the softening point test?
Following are the main factors that affect the softening point of bitumen;
- i)- Rate of heating.
- ii)- Grade of bitumen (harder the grade, more will be the softening point)
Which bitumen does not need heat?
Which bitumen does not need heating? Explanation: The cutback bitumen which is the most economical type may or may not require heating, whereas the remaining required to be heated.
What do you mean by 80 100 of bitumen?
Bitumen Penetration Grade 80/100 is a standard penetration grade Bitumen usually used as a Paving Grade Bitumen suitable for road construction and for the production of asphalt pavements with superior properties. The Bitumen supplied by RABIT Trading Co. is produced from the vacuum residue (short residue) feedstock.
How can the softening point of bitumen be increased?
Increase in thermoelastoplastics content leads to higher softening point. When its content is increased from 1% to 1,5%, softening point value is increased by 5 °C. The expected decrease in ductility of bitumen at 25 °C was recorded and ductility grew by 30 % at 0 °C.
What is softening point test?
Softening point test of bitumen is done to determine the consistency of bitumen. Softening point is defined as the temperature at which bitumen softens beyond some arbitrary softness i.e. bitumen softens and sags down about 25mm below the weight of steel ball.
Why do we test softening point?
Significance. The softening point helps in the determination of the temperature beyond which the bitumen is softened beyond a pre-specified softness. Hence, the softening point test of bitumen helps in knowing the maximum temperature to which the given bitumen can be exposed.
Which of the following property of bitumen is determined by using P * * * * * * * * * * Test?
Penetration test of Bitumen determines the hardness or softness of bitumen by measuring the depth in millimeter to which a standard loaded needle will penetrate vertically in five seconds while the temperature of the bitumen sample is maintained at 25 C.
How is the softening point of bitumen determined?
The softening point is defined as the mean of the temperatures at which the bitumen disks soften and sag downwards a distance of 25 mm under the weight of a steel ball. 1- This method is useful in determining the consistency of bitumen as one element in establishing the uniformity of shipments or sources of supply.
Which is the softening point of bitumen in Lahore?
The experiment has been performed successfully and the softening point came out to be 46.4 o C. Bitumen having this softening point should not be used in Lahore as the city’s highest maximum temperature was 48.3 °C recorded on May 30, 1944 And 48 °C was recorded on June 10, 2007.
What’s the significance of the softening point test?
Significance of Softening point test of bitumen The softening point of bitumen used in the pavement construction varies between 35° to 70°.It indicates how susceptible the bitumen with respect to the variation of temperature.
How long does it take to soften a bitumen disk?
Cool the specimen disks for a minimum of 30 min. In no case shall more than 240 min elapse before completion of the test. Cool specimens that are soft at room temperature for at least 30 min at a minimum of 8 °C below the expected softening point. After cooling, cut the excess material off cleanly with a slightly heated knife or spatula.
